Bryant Electric GFTR15OW 15-Amp 125-volt Commercial LED Tamper Resistant Indicator with Weather Resistant Duplex GFCI Receptacle, Office White Comprehensive diagnostics - When test button is actuated, both the electronic components and mechanical trip mechanism are functionally tested Ground fault end-of-life indicator included; Flashing RED indicates device has lost capability to provide protection No power at face if reverse wired; open circuit condition eliminates false assumption of protection at face Easy to install with internal back wiring, captive mounting screws and an automatic self-grounding staple Meets UL498 for receptacles, UL943 Class A for GFCIs UL File E41978. CSA Certified